Updated at 8:20 p.m. Aug. 6, 2015
Fourth Avenue was closed between B Street and Broadway on Wednesday after two 4- to 6-inch wide depressions were discovered near the trolley tracks at C Street .
The San Diego Metropolitan Transit System discovered the sinkholes next to a manhole Wednesday morning and informed the San Diego Public Utility Department, San Diego public information officer Arian Collins said.
The concern was that a leak in the sewer line could damage the tracks. Crews, however, did not find any leaks after sending a camera down to inspect the line, Collins said.
The street closure disrupted the Blue and Orange trolley lines and passengers going through downtown experienced a 15 to 20-minute delay, according to MTS.
The closure is expected to last till Friday as crews try to determine the cause of the depressions, which were initially reported as a water main break.
The cause could be something as simple as the soil settling or as serious as leaks in the sewer line but crews won’t know until they dig, Collins said.
“We’re gonna have excavate the area and get a better look to see what’s below the asphalt,” he said.
In the mean time, the Blue Line service will terminate at the Fifth Avenue station, and Orange Line service at the Civic Center station. A shuttle will operate between America Plaza and the Civic Center station.
Fourth Avenue will be closed to traffic between B Street and Broadway.
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